IDEXX Cystatin B Test algorithm:
Interpreting normal and increased results

Interpreting normal results

Interpreting increased results

*IRIS is the International Renal Interest Society.


  1. Segev G, Vaden S, Ross S, et al. Urinary cystatin B differentiates progressive versus stable IRIS Stage 1 chronic kidney disease in dogs. J Vet Intern Med. Published online October 10, 2023. 

  2. Data on file at IDEXX Reference Laboratories, Inc. Westbrook, Maine USA.

The information contained herein is intended to provide general guidance only. As with any diagnosis or treatment, you should use clinical discretion with each patient based on a complete evaluation of the patient, including history, physical presentation, and complete laboratory data. With respect to any drug therapy or monitoring program, you should refer to product inserts for a complete description of dosages, indications, interactions, and cautions.